Read this:Blanching due to vasospasmVasospasm, which is more severe, is a sudden constriction/narrowing of a blood vessel (in the nipple, in this case) that is extremely painful. It might occur a short time after nursing or in between nursings. Vasospasm can have various causes: Vasospasm can be a secondary response to pain or nipple trauma (damaged nipples or thrush). In this case, the nipple(s) turns white shortly after nursing (rather than coming out of baby's mouth white and misformed). Mom might notice a white circle on the face of the nipple a few seconds to a few minutes after breastfeeding. Cold often triggers the vasospasm and/or makes it worse. Unlike blanching due to compression, latch and positioning may be fine if the source of any nipple damage has already been fixed. Healing the nipple trauma or other source of pain should eliminate the vasospasms, although they may persist for a short time after the nipple has healed (previously damaged tissue can remain sensitive for a time).
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